Ball Valve Performance Overview: The ball valve is evolved from the cock, and its opening and closing pieces as a sphere, the use of the ball around the axis of the stem rotation to achieve the purpose of opening and closing. Ball valve in the pipeline is mainly used to cut off, distribute and change the direction of medium flow, the design of the opening of the ball valve also has a good flow regulation. The ball valve not only has the advantages of simple structure and good sealing performance, but also has the advantages of small volume, light weight, less material consumption, small installation size, small driving torque, easy operation and quick opening and closing One of the fastest growing valve varieties in more than a decade. Especially in the developed countries such as the United States, Japan, Germany, France, Italy, the West, Britain and other developed countries, the use of ball valves is very wide, the varieties and quantities are still expanding, and to the high temperature, high pressure, large mouth, high sealing, long Life expectancy, excellent regulation performance and multi-functional development of a valve, its reliability and other performance indicators have reached a high level, and has partially replaced the gate valve, globe valve, throttle valve. As the ball valve technology advances, in the foreseeable short-term, especially in the oil and gas pipelines, refinery cracking unit and the nuclear industry will have a wider range of applications. In addition, ball valves will also be one of the leading types of valves in large and medium caliber, medium and low pressure applications in other industries. Ball valve advantages: 1. Has the lowest flow resistance (actually zero). 2. In the work will not get stuck (in the absence of lubricant), it can be reliably used with corrosive media and low boiling point liquid. 3 in the work will not get stuck (in the absence of lubricant), it can be reliably used with corrosive media and low boiling point liquid. 4. Can achieve fast opening and closing, opening and closing time of some structures only to ensure that the test bed can be used in automation systems. Quick opening and closing the valve, the operation without impact. 5. The ball closure can be positioned automatically. 6. Ball closure can be automatically positioned in position. 7. In the fully open and fully closed, the sealing surface of the ball and valve seat and the media isolation, so the high speed through the valve medium will not cause erosion of the sealing surface. Compact, light weight, it can be considered when it is used for low temperature medium system, the most reasonable valve structure. 9. Symmetrical valve body, especially when welded body structure, can well withstand the stress from the pipeline. 10. Closure can withstand the high pressure drop when closed. 11. All-welded ball valve can be buried directly in the ground, so that the valve parts from erosion, the maximum life expectancy of up to 30 years, the oil and gas pipelines the ideal valve. As the ball valve has the above advantages, so a wide range of applications, ball valve can be applied to: 1. Nominal pass from 8mm to 1200mm. 2. Nominal pressure from vacuum to 42MPA. 3 working temperature from -204 ℃ -815 ℃. Ball valve is the most important seat ring PTFE material "), it is almost inert to all chemical substances, and has a small friction coefficient, stable performance, easy to aging, wide temperature range and excellent sealing performance However, the physical properties of polytetrafluoroethylene, including its high coefficient of expansion, sensitivity to cold flow and poor thermal conductivity, require that the seat seal design be centered around these characteristics. Materials also include PTFE, Nylon, and many other materials, however, the reliability of the seal is compromised as the seal material hardens, especially at low differential pressure. In addition, Synthetic rubber can also be used as the seat sealing material, but it is suitable for media and the use of the temperature range of drug is limited.If the medium is not lubricated, the use of synthetic rubber easily stuck ball .In order to meet the high temperature, high pressure, strong erosion , Long life and other industrial applications, the requirements of the past decade, the metal seal ball valve has been a great development, especially in the industrial development The United States, Italy, Germany, the troupe also, the Netherlands, the ball valve structure continues to improve, there are all-welded valve body buried ball valve, lift ball valve, the ball valve in the long-distance pipeline, oil refining plant and other industrial areas Ball valves have reached an entirely new level of technology due to the growing availability of ball valves with large bore diameters (3050 mm) (70 MPA) (-196 ° C to -815 ° C) .Due to computer aided design (CAD) and computer-aided manufacturing CAM) and flexible manufacturing system (FMS) in the valve industry, the design and manufacture of ball valves to a whole new level not only to completely reform the valve design and calculation methods to reduce the professional and technical staff of the heavy repetitive conventional design work, So that technicians have more energy for improvement, improve product performance and new product development, shorten the research and development cycle of new products, improve overall labor productivity, and lift rod metal seal ball valve research and development process, due to CAD / The application of CAM, appeared by the computer aided design, by computer-aided numerical control machine tool manufacturing Spiral flat stem, the metal seal ball valve in the opening and closing process without any abrasion and wear, so that the ball valve seal and greatly enhance the service life.When the valve is fully open, the flow resistance is very small, almost equal to zero, so the iso Ball valves are widely used in oil and gas pipelines for easy pipe cleaning. Most ball valves are used in media with suspended solids due to ball wiping of the ball valve during opening and closing, and the materials used to seal the rings are also available Powdery and granular media Ball valve applications: Ball valves are usually restricted by the material of the seat ring because the ball valves are usually made of rubber, nylon and Teflon as the seat ring material. Is based on the metal ball under the action of the medium, the plastic seat pressed together to complete the (floating ball valve). Sealing ring in a certain contact pressure, the elastic deformation occurred in some areas .This deformation Can compensate for the ball manufacturing accuracy and surface roughness to ensure that the ball valve sealing performance. And because the ball valve seat ring is usually made of plastic, so in the choice of ball valve structure and performance, to consider the ball valve fire and fire, especially in petroleum, chemical, metallurgical and other departments, flammable and explosive media The use of equipment and piping system ball valve, but should pay attention to fire and fire. Normally, the sealing performance is strictly controlled at two positions, the mud, wear and contraction channels, rapid opening and closing movements (1/4 turn on and off), high pressure cutoff (large pressure drop), low noise, cavitation and gasification, A small amount of leakage to the atmosphere, the operating torque is small, the fluid resistance of small pipe systems, the recommended use of the ball valve. Ball valve is also suitable for light structure, low pressure cutoff (small pressure difference), corrosive medium piping system. Ball valves are also available in cryogenic (cryogenic) systems and piping systems. Oxygen piping systems in the metallurgical industry require the use of carefully degreased ball valves. In the oil pipeline and gas pipeline in the main line to be buried in the ground, you need to use full-bore welded ball valve. When required to have regulatory performance, the need to use a special structure with a V-shaped opening ball valve. In petroleum, petrochemical, chemical, electric power, urban construction, the working temperature above 200 ℃ piping system can choose metal to metal sealed ball valve. Ball valve selection principles: 1. Oil, natural gas pipeline transportation, need to clean the pipeline, but also need to be buried in the ground, the choice of all-pass, all-welded ball valve; buried in the ground, the choice of all through the welding connection or Flanged ball valve; branch pipe, the choice of flange connection, welding connection, all through or reduced diameter ball valve. 2. Oil product pipeline and storage equipment, the choice of flanged ball valve. 3. City gas and natural gas pipeline, the choice of flange connection and internal thread floating ball valve. 4. Metallurgical systems in the oxygen pipeline system, should be adopted after strict degreasing, flanged fixed ball valve. 5. Low-temperature medium piping systems and devices, should use the valve cover plus the low-temperature ball valve. 6 oil refinery catalytic cracking unit piping system, optional lifting rod valve. 7. Chemical systems acid and alkali and other corrosive media devices and piping systems, should be made of austenitic stainless steel, PTFE valve seat ring all stainless steel ball valve. 8. Metallurgical systems, power systems, petrochemical plants, urban heating systems in high temperature medium piping system or device, the choice of metal to metal seal ball valve. 9. Need to adjust the flow, the choice of worm-driven, pneumatic or electric with V-shaped opening of the regulating valve.
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